This is not going to happen because you cannot fit a battle against Coby in the current time line. It can only happen during epilogue past Imu's sama defeat, and by then it doesn't fit either to have grudge because of boa.
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Boa is attracting almost every men because of her beauty. Jokes on you. Strongest on verse.
Is she even attracting them to want to fight her? No
Are the persons she attracting strong? No
Her whole niche is her beauty and even that's not enough hence why oda had to give her a fruit to further help her in the attracting regard